Sphinctospermum

Sphinctospermum
Conservation status
Apparently Secure  (NatureServe)[1]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Fabales
Family:	Fabaceae
Subfamily:	Faboideae
Tribe:	Robinieae
Genus:	Sphinctospermum Rose
Species:	S. constrictum
Binomial name
Sphinctospermum constrictum (S.Watson) Rose
Synonyms[2]
Cracca constricta (S.Watson) Tidestr. Tephrosia constricta S.Watson

Sphinctospermum is a genus of flowering plants in the legume family, Fabaceae. It belongs to the subfamily Faboideae. It is a monotypic genus, containing the single species Sphinctospermum constrictum. It is native to North America, where it occurs in western and central Mexico and in Arizona in the southwestern United States.[2][1][3] The plant is known by the common name hourglass peaseed.[4]

This species occurs in grasslands and dry forests. It grows in sandy soils and is more common in wet years.[1]

References

1. NatureServe. "Sphinctospermum constrictum". NatureServe Explorer. Arlington, Virginia.
2. "Sphinctospermum constrictum (S.Watson) Rose". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 20 September 2023.
3. Lavin, Matt; Doyle, Jeff J. (1991). "Tribal Relationships of Sphinctospermum (Leguminosae): Integration of Traditional and Chloroplast DNA Data". Systematic Botany. 16 (1): 162–172. doi:10.2307/2418980. ISSN 0363-6445. JSTOR 2418980.
4. NRCS. "Sphinctospermum constrictum". PLANTS Database. United States Department of Agriculture (USDA).

External links

• Sphictospermum. The Plant List.

Further reading

Lavin, M. 1990. The genus Sphinctospermum (Leguminosae): Taxonomy and tribal relationships as inferred from a cladistic analysis of traditional data. Systematic Botany Vol. 15, No. 4 pp. 544–559